What is the name of the movement of the Earth around the Sun as pointed out by letter J.

Answers

Answer 1

Answer:
it is called the Earth's rotation

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Complete and balance the following equation: BrO3−(aq)+N2H4(aq)→Br2(l)+N2(g)

Answers

BrO3- + 6H+ + 6e-= Br- + 3 H2O
N2H4 = N2 + 4 H+ + 4e-
2 BrO3- + 3 N2H4 = 2 Br- + 3 N2 + 6 H2O

A _____ change occurs when a substance changes phase.
physical
chemical
nuclear

Answers

A physical change occurs when a substance changes phase.

For example, boiling pure water (H₂O) is physical change of substance (from liquid to gaseous state). In physical change, the bonds between oxygen and hydrogen can not be separated.

Sublimation of iodine (from solid to gas state) is also physical change.

Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change.

Final answer:

A physical change occurs when a substance changes phase. In this process, a substance may change from one state of matter to another but its foundational substance remains the same.

Explanation:

A physical change takes place when a substance alters its phase. This means that it shifts from one state of matter (solid, liquid, gas) to another. It's crucial to remember that although the physical characteristics of the substance may change, its substance does not. Let's take an example of water, it can exist as solid (ice), liquid (water), and gas (steam) but in all these states it remains H2O. Therefore, when a substance changes phase, it undergoes a physical change, not a chemical or a nuclear change.

Learn more about Phase Change here:

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Given the balanced equation representing a phase change:C6H4Cl2(s) + energy==>C6H4Cl2(g)
Which statement describes this change?
(1) It is endothermic, and entropy decreases.
(2) It is endothermic, and entropy increases.
(3) It is exothermic, and entropy decreases.
(4) It is exothermic, and entropy increases.

Answers

Answer: (2) It is endothermic, and entropy increases.

Explanation: Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

In the given reaction:

$C_6H_4Cl_2(s)+energy\rightarrow C_6H_4Cl_2(g)$

The energy is absorbed by the reactants and thus it is endothermic and the solid reactants are converting to gaseous products, thus the entropy increases.

The answer is (2). The energy is at left of the equation, so it absorbs energy. It is called endothermic. And the entropy is a measure of disorder. The disorder degree of gas is more than solid. So the entropy increases.

Ions can have a positive or negative charge. false or true

Answers

True. Ions can have a positive or negative charge.

I want to say that its true

Commercially valuable fish my face extinction even though fish are a renewable resource?true
false?

Answers

the answer is true they may face extinction

You are walking in Paris alongside the Eiffel Tower and suddenly a croissant smacks you on the head and knocks you to the ground. From your handy dandy tourist guidebook you find that the height of the Eiffel Tower is 300.5 m. If you neglect air resistance, calculate how many seconds the croissant dropped before it tagged you on the head.

Answers

Neglecting air resistance (that is, if you and the Eiffel Tower were in a giant vacuum chamber), the bagel would take 7.804 s to hit you on the head.

I will assume that you are 1.8 m tall, so the distance the bagel falls before it hits you on the head is

300.5 m - 1.8 m = 298.7 m

One of the important equations relating distance and acceleration is

s = v₀ +½at², where

s = distance,
v₀ = initial velocity,
a = acceleration, and
t = time.

I also assume that the person at the top of the tower didn't throw the bagel down at you, so v₀ = 0.

a is the acceleration due to gravity, which is 9.8099 m·s⁻² in Paris.

s = v₀ + ½ at²

298.7 m = 0 + ½ × 9.8099 m·s⁻² × t²

298.7 = 4.9050 t² s⁻²

t² = $(298.7 \text m)/( 4.9050 \text s^(-2))$ = 60.898 s²

t = $\sqrt{60.898 s^(2)}$ = 7.804 s

The time taken for the croissant to hit you on the head assuming you are 1.5 m tall is 7.73 s

Considering the question given above, your height was not stated.